How To sand or treat a large area of old thinset from a concrete slab
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Oh Connie, I am SO sorry, my only advice is exactly what you said you feel you cannot have done. Concrete/thinset/mortar is VERY tough stuff - you will have to grind/sand it off of there as far as I know.
Not sure if this would work but have you considered putting a layer of cement on top and smoothing? Like filling holes in your wall.
There is actually a scrapper that is specifically made to scrape all that off. I am not going to say it's easy, but it beats getting down on your knees or all the dust grinding/sanding will create.
Why not use self leveling floor level and tint it to the color you want if your goal is to have polished concrete
Home depot has a Mortar Dissolver
on my way I’ll try anything
Scraping off with an Ice scrape is what i have always done. Then use a cement floor leveling compound to smooth out the concrete.